How do I fix a fan heater fan switch that stopped blowing at all speeds?
You will first need to determine if the switch is the problem, or if the blower motor or a fuse is the issue. Once you have determined the root cause of the problem you can take the proper repair/replacement action from there. It sounds as though your blower motor may have died.
Also it may be the blower motor speed resistor. I replaced the resistor in my Rendezvous and now the fan works in all 5 speeds.